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Source: 恒星英语学习网  snow  2008-01-14  我要投稿   论坛   Favorite  

John didn't do his homework ____ his father came home from work.

A. unless   B. while   C. until    D. just as

  

昨日习题答案:

D. Having been ignored for many years, the writer suddenly became famous.


句意:这位作家被忽视了多年以后突然有了名气。 
现在分词短语作状语,表示时间。现在分词的逻辑主语也就是主句中的主语,所以用被动语态。


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